chore(release): publish scoped ink shim packages

[RtlZeroMemory]

Summary

• Add scoped shim packages:
  • @rezi-ui/ink-gradient-shim
  • @rezi-ui/ink-spinner-shim
• Wire both packages into release version sync (scripts/release-set-version.mjs).
• Publish both packages in release workflow (.github/workflows/release.yml).

Why

The npm org package page for @rezi-ui only lists scoped packages. Existing shims are unscoped (ink-gradient-shim, ink-spinner-shim), so they don't show up there even though they are published.

This adds scoped aliases so users can discover and consume shim packages directly under the @rezi-ui namespace.

Validation

• npm pack --dry-run ./packages/rezi-ink-gradient-shim
• npm pack --dry-run ./packages/rezi-ink-spinner-shim

[coderabbitai]

Caution

Review failed

The head commit changed during the review from 414f9e7 to 2b5e95f.

✨ Finishing Touches

• 📝 Generate docstrings (stacked PR)
• 📝 Generate docstrings (commit on current branch)

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feat/scoped-shim-aliases

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